package xml.demo;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.FileOutputStream;

public class demo6 {
    public static void main(String[] args) {
        //得到DOM解析器的工厂实例
        DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
        //从DOM工厂获得DOM解析器
        DocumentBuilder db= null;
        try {
            db = dbf.newDocumentBuilder();
            //解析XML文档，得到一个Document对象，即DOM树
            Document doc=db.parse("src/xml/demo1.xml");
            //找到要删除的节点
            NodeList list=doc.getElementsByTagName("Brand");
            for(int i=0;i<list.getLength();i++){
                Element brandElement=(Element)list.item(i);
                String brandName=brandElement.getAttribute("name");
                if(brandName.equals("SAMSUNG")){
                    brandElement.getParentNode().removeChild(brandElement);
                }
                //保存XML文件
                TransformerFactory transformerFactory=TransformerFactory.newInstance();
                Transformer transformer=transformerFactory.newTransformer();
                DOMSource domSource=new DOMSource(doc);
                //设置编码类型
                transformer.setOutputProperty(OutputKeys.ENCODING,"utf-8");
                StreamResult result=new StreamResult(new FileOutputStream("src/xml/demo1.xml"));
                //把DOM树转换为XML文件
                transformer.transform(domSource,result);
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}
